Pointers to self rendered incorrectly

Consider the example given in the README:

```go
type Circular struct {
	Self *Circular
}

selfref := Circular{}
selfref.Self = &selfref
```

This produces the following output:

```go
main.Circular{
  Self: &main.Circular{// p0
    Self: p0,
  },
}
```

While the expected output is:

```go
main.Circular{// p0
  Self: p0,
}
```